Learning goals: Teacher Facing Critique (in writing) a strategy using the Pythagorean Identity for identifying the value of sine and tangent from the known value of cosine and the quadrant of the angle. Use the Pythagorean Identity to determine the value of all 3 trigonometric ratios given the value of 1 to start from and the quadrant of the angle. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg2.6 Trigonometric Functions, Algebra 2.